LTC3706_15 Datasheet, PDF (22/22 Pages) Linear Technology – Secondary-Side Synchronous Forward Controller with PolyPhase Capability

LTC3706
TYPICAL APPLICATION
L1
1µH
+V_IN
1.0µF
100V
1.0µF
100V
×3
–V_IN
36V to 72V to 5V/20A Isolated Forward Converter
5 ^T1
L2
0.87µH
3_• ⁹
4
2_{• •}7
2.4Ω
14W
1.5nF
50V
510Ω
V_SW
CMPSH1-4
1.2Ω
1/4W
Si7450DP
1nF
200V
Si7336ADP
0.022Ω _2.2nF VA 0.002Ω
1W
250V
1W
Si7336ADP
100µF
6.3V
×3 ₊
4.7µF
25V
VA
100Ω
330pF
100Ω 100Ω
MMBZ5236B
1k 1/4W ^7.5V
+V_OUT
4.42k
220µF
6.3V
2.2µF
–V_OUT
100k
FDC2512
(SOT6)
365k
V_CC
FB/IN⁺
1µF
UVLO LTC3725
470nF
SSFLT
FS/IN^–
15.0k
33nF
220µF 6.3V SANYO 6TPE220MI
2.2nF 250V MURATA GA343QR7GD222KW01L
L1: VISHAY IHLP-2525CZER1R0M-01
L2: COOPER HC1-R87
T1: PULSE PA0811 (4:4:2)
T2: PULSE PA0297 2(1.5mH):1:1
3.01k
100Ω
0.1µF
5.1k
330pF
IS^–
IS⁺
1
T2
1:2
1µF
3, 4
PT⁺
••
470pF
8
5, 6
100k ^{VSW 10pF 1N4148W}
PT^–
RUN/SS
2N7002
536Ω
33nF
FCX491
LTC3706
FB
604Ω
124k 100k 6.2k
2.2nF
47pF
3706 TA02
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC3726/LTC3725
Isolated Synchronous No Opto-Forward Controller Chip Ideal for Medium Power 24V or 48V Input Applications
Set
LT1952/LT1952-1
Isolated Synchronous Forward Controllers
Ideal for Medium Power 24V or 48V Input Applications
LTC3723-1/LTC3723-2 Synchronous Push-Pull and Full-Bridge Controllers High Efficiency with On-Chip MOSFET Drivers
LTC3721-1/LTC3721-2 Nonsynchronous Push-Pull and Full-Bridge Controllers Minimizes External Components, On-Chip MOSFET Drivers
LTC3722/LTC2722-2 Synchronous Isolated Full-Bridge Controllers
Ideal for High Power 24V or 48V Input Applications
LT3748
100V No Opto-Flyback Controller
5V ≤ V_IN ≤ 100V, Boundary Mode Operation, MSOP-16 with Extra High
Voltage Pin Spacing
LT3758
LTC1871/LTC1871-1
LTC1871-7
Boost, Flyback, SEPIC and Inverting Controller
5.5V ≤ V_IN ≤ 100V, 100kHz to 1MHz Fixed Frequency,
3mm × 3mm DFN-10 and MSOP-10E Package
Wide Input Range, No R_SENSE™ Low Quiescent Current 2.5V ≤ V_IN ≤ 36V, Burst Mode^® Operation at Light Load, MSOP-10
Flyback, Boost and SEPIC Controller
LTC3803/LTC3803-3 Flyback DC/DC Controller with Fixed 200kHz or 300kHz V_IN and V_OUT Limited Only by External Components, 6-Pin ThinSOT™
LTC3803-5
Operating Frequency
Package
LT3575
Isolated Flyback No Opto-Converter with 2.5A/60V
Power Switch
3V ≤ V_IN ≤ 40V, Boundary Mode, Up to 14W, TSSOP-16 Package
3706fd
22 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
LT 0711 REV D • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2005